Can I add another vote to MicroUSB input for this? It's easier to find a high quality Micro cable than a Mini cable these days, and I've had trouble with DACs when using less-than-excellent cables before (not a sound quality difference, just trouble getting it work consistently) .

The signal in the USB cable is digital so signal loss or signal degradation is not really an issue, unless the cable is very long and/or poorly made. It's for audio signals that you want high-quality cables.

The problem I had seems to be more about the connector than the cable. On devices I own, I notice that mini USB have more and larger solder pads compared to micro USB, and are therefore more reliable. In fact, I would prefer it if this uses the comparatively large B connectors (the square looking ones used on printers) because I've never had one of those fail on me.

It is exactly the large Type-B connectors that give me the most trouble with DACs (again, no degradation issues, just poor contact and reliability). Mini cables tend to be okay, but I have more Micro cables that I know I can trust than Mini.